AutoCodes – Cadillac – U135D Cadillac

U135D Cadillac Code - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U135D Cadillac indicates Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2.
Common causes: Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Transmission Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 441

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U135D Cadillac Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U135D Cadillac - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2 - AutoCodes.com — U135D Cadillac Code - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2

What does this mean?

What are the Possible Causes of the DTC U135D Cadillac?

Faulty Transmission Control Module
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U135D Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U135D Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U135D Cadillac Code

1. What are common symptoms of the U135D OBDII code in a Cadillac?

- Common symptoms include transmission shifting issues, vehicle stalling, loss of power, and illuminated warning lights on the dashboard.

2. What can cause the U135D OBDII code in a Cadillac?

- The U135D code is typically triggered by a communication breakdown between the Chassis Control Module and the Transmission Control Module due to faulty wiring, a loose connection, or a malfunctioning module.

3. How can I diagnose the U135D code in my Cadillac?

- A professional diagnostic scan tool can be used to retrieve the specific codes and pinpoint the communication error between the modules. Checking the wiring harness and connectors for damage or corrosion is also recommended.

4. What are the repair options for the U135D code in a Cadillac?

- Repair options include repairing or replacing damaged wiring, ensuring proper connections between modules, and resetting the fault codes using a diagnostic tool. In some cases, replacing a faulty module may be necessary.

5. Can I drive my Cadillac with the U135D code present?

- It is not recommended to drive the vehicle with the U135D code as it can lead to potential transmission issues and safety hazards. Prompt diagnosis and repair are advised.

6. How can I prevent the U135D OBDII code from reoccurring in my Cadillac?

- Regular maintenance checks, avoiding water damage to electrical components, and ensuring proper wiring connections can help prevent the U135D code from reoccurring.

7. Is it safe to clear the U135D code using a diagnostic tool?

- Clearing the code using a diagnostic tool is safe after the underlying communication issue has been addressed and repaired. However, it is important to ensure the issue is fully resolved to prevent further problems.

8. How long does it typically take to repair the U135D code in a Cadillac?

- The repair time for the U135D code can vary depending on the exact cause of the communication error. Simple fixes like checking connections may take a short time, while more complex issues may require additional diagnostics and repairs.

9. Are there any recalls or technical service bulletins related to the U135D code in Cadillacs?

- It's recommended to check with a Cadillac dealership or the manufacturer's website for any recalls or technical service bulletins related to the U135D code to see if there are known issues or solutions.

10. Can a DIY enthusiast fix the U135D code in a Cadillac?

- While some basic checks like inspecting wiring connections can be done by a DIY enthusiast, diagnosing and repairing the specific cause of the U135D code may require professional expertise and tools.